JPS61246010A - Manufacture of mold - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The invention relates to a method according to the preamble of claim 1 for the production of molds, and more particularly to the production of irregularly shaped molds.

PRIOR ART AND THE PROBLEM TO BE SOLVED BY THE INVENTION Although the method relates in particular to the production of molds for concrete panels, the method is applicable to molding techniques for any material to be cast or It can also be applied to the production of such molds where the filling temperature is within certain limits.

Molding techniques are generally based on a material structure being molded around a desired formed piece, and the formed piece being separable from the material structure, thereby forming the final piece. can be cast into the resulting recess by known methods. For inlaying, the final material is 1
shape or other shape, typically under conditions that are fluid, compressible, extrudable or molten.

Under these circumstances, the mold can be kept solid in several stages and is generally constructed of an easily deformable material that withstands the casting conditions; solidification may be caused by e.g. can be done.

This is because the metal casting mold is mixed with sand and binder.
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Through various hydration reactions,
This ends with setting taking place, as is done by the setting effect of plaster.

On the other hand, molds allow solid materials to be manufactured into the desired shape, in which case the material to be cast must have an appropriate hardness.

This is the typical procedure in current concrete tinning technology, where the molding material used is either metal, wood, plastic, or the like, and the mold is most commonly oriented in five directions. It is a structure limited from . A fluid or fairly stiff concrete mix is cast into the mold. This mix must end up being packed in such a way that it is completely illuminated within all the spaces within the mold.

The concrete casting technology described above does not require that the materials used are excessively one-sided in the composition of the mold, such as metal sheets,
The problem so far has been limited to flat surfaces, including molded plywood, planks, or different plastic plates and plastic compositions. Creating free shapes requires difficult and expensive work. Furthermore, the production of molds of the above-mentioned type requires a lot of manual labor and storage area and is therefore expensive.

In most cases, such molds provide continuous lengths of 10 to 50 pieces for concrete panels, although they are not completely disposable. However, the cost of the molds is so high that the molds are in any case stored for a certain period of time when the corresponding series is being repeated.

From the above it has been seen that the mold requires a lot of manual labor and very expensive materials. Moreover, molds are always considerably more expensive than products produced by that means, and the proportion of molds in the price of products only increases in significance (sig) when the length of the series is several thousand pieces.
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Prefabricated concrete panels
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n) Regarding the automation of industry, or in general industry using casting technology, the concrete panel technology described above does not offer any simple possibility for automatic production of molds.

Means for solving the problem The object of the present invention is to obviate the drawbacks present in the above-mentioned prior art techniques and to provide an entirely new type of method for the production of molds.

This purpose is rumored - each mold blank (would blank)
is manufactured by dispensing the fluid organic polymeric material into a box-shaped container, for example open at the top and corresponding to the dimensions of the desired mold; - machining; the polymeric material separated from the blank is recovered; and--this recovered material is heated above its melting point and is no longer needed to provide the blank for a new mold. This can be achieved by the method according to the invention, which is based on feeding onto a mold such as:

The invention makes it possible to combine the automatic production of molds and the use of completely free shapes in a way that has not been applied in the prior art.

The method according to the invention will be explained in more detail below with reference to the accompanying drawings.

EXAMPLE The method takes into account the fact that free-form molds are produced by means of numerically controlled mechanical tools 3 to 5 which move along rails 6 and form the molds from blanks of suitable material 8. I'm star-struck. fi
The machinists 3 to 5 receive numerical commands from the computer 2 which reads the drawings, and the mechanical tools copy the design shown by the drawings into the molding material 8 in three dimensions at the desired scale, so that they can be read according to the drawings. The details and limitations indicated will be taken into account. Numerically controlled 8 to form mold material 8! The mechanics 3 to 5 receive the drawing data directly from the magnetic or other data set 1 without an optical reading device or by means of an optical reading device.

Concrete 13 is then cast from figurine 14 into the already processed mold 8 in a manner known per se.

Advantageous mold materials 8 suitable for this technique are those which, according to the invention, can be used many times for forming new mold blanks.

Such materials are, for example, organic polymers whose molecular weight is so low that they have adequate fluidity at reasonable temperatures. This allows these materials to be used as preliminary blanks.
k) into the desired space 7 and then the final mold can be prepared.

The above-mentioned WJI preferably melts at a temperature below 150°C.
The production of a mold from an organic polymeric material of M is carried out as follows: filling the entire space 7 into a defined space 7 from five sides in which the mold blank is supported in order to be molded. , the polymeric material 8 is cast as a molten material. After this material 8 has solidified, the desired shape is milled into it by using heat or mechanical milling or both at the same time.

Separated material 12 to be removed by milling
is collected in a container 11 and, after melting carried out by a heating spiral 16, is passed back through a valve 10 and a pump 15 onto another mold structure that has already been discarded or used. This allows the material to refill the indentations made in the previous mold and allows form-milling of the updated shape (Figure 3).
.

Typical advantageous polymeric materials meeting the requirements of the molding technology are, for example, polymeric waxes having a molecular weight of 1500 to 3300, as well as various polymerized products of tall oil.

[Brief explanation of the drawing]

1 to 3 are schematic partial views of one embodiment of the method of the invention as successive process steps. 1...Data set 2...Computers 3-5...Machine tools 71, Space 8...Mold material (polymer material) 11...Container 12...Material 15...Bomb drawing engraving (No change in content) Procedural continuation formal document (daytime) May 21, 1986

Claims (1)

[Claims] 1. A mechanical tool (3) controlled by a computer (2) based on a dimensioning data set (1).
In the method of manufacturing molds from blanks of molding material (8) by machining each blank into the desired shape according to 5), - each mold blank is e.g. open at the top and shaped into the desired mold manufactured by feeding a fluid organic polymeric material (8) into a box-shaped container (7) corresponding to the size of - the polymeric material separated from the blank during machining (
12) is recovered, and - this recovered material (12) is heated to a temperature above its melting point and is placed on the mold such that it is no longer needed, such that it provides a blank for a new mold. A method characterized by being supplied with. 2. The method as claimed in claim 1, wherein the polymer material (8) is a material polymerized in a manner known per se from polyethylene wax, parine or tall oil. 3. A method according to claim 1, wherein the recovered polymeric material (12) separated from the blank during machining is conveyed into a separate container (11). 4. The recovered polymeric material (12) is placed in the container (11).
4. The method according to claim 3, wherein the method is heated in 5. The method according to claim 1, wherein milling is used for machining. 6. The method according to claim 1, wherein hot shearing is used for machining. 7. The organic polymer material (1) having a melting point lower than 150°C
8) is used.